leetcode——263——Ugly Number

Write a program to check whether a given number is an ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3,5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.

Note that 1 is typically treated as an ugly number.

class Solution {
public:
    bool isUgly(int num) {
        
        if(num<1)
           return false;
        
        while(num%2 ==0)
           num/=2;
        while(num%3 ==0)
           num/=3;
        while(num%5 == 0)
           num/=5;
        
        return num ==1;
    }
};